I know this is an old thread, but I’m having this problem as well. When I bought my 04, it already had 31s and the rugged ridge carrier mentioned in this thread. The tire wasn’t touching the snubbers, and was just hanging in mid air. I didn’t like this, and having had 31s on previous TJs in the past, decided to buy a used oem carrier on eBay.
The part came, I took the rugged ridge carrier off, installed the one carrier and I can’t put the spare on. With the tire inflated, the wheel studs don’t even stick thru enough to get the lugs started. This is a Columbia edition, so it has the Ecco wheels (painted gray). I’m thinking I’m gonna take the snubbers off, cut them down with a band saw, and try that.
Also, I’ve noticed the bottom of the tire is JUST touching the top of the rear bumper, which doesn’t bother me, I just don’t remember any of my other TJs being that close. The tires are 31 10.5 BFG A/Ts by the way. They’ve only got a few thousand miles on them.
Just throwing it out there that this isn’t a one off problem. It must be the backspacing on the Ecco wheels.